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.r-rr Monitoring Well Installation and Quarterly Report - First Quarter 2002 ENTERPRISE INVESTMENTS (Former J.B. Murphy Trucking) 355 Enterprise Place,Tracy, California 1.0. INTRODUCTION 4 At the request of Mr. Monty Warren of Enterprise Investments,Advanced GeoEnvironmental,Inc. € � (AGE) has prepared this monitoring well installation and quarterly report for the property located at 355 Enterprise Place, Tracy, California. The site and the surrounding area are illustrated on �= Figure 1. Structures,boring and well locations are illustrated on Figure 2. Background information r` is summarized in the AGE-prepared Monitoring Well Installation Work Plan -November 2000, dated 27 November 2000. 2.0. PROCEDURES i Five ground water monitoring wells (MW1 through MW5) and one ground water extraction well (EW l)were installed in January 2002 and developed and sampled in February 2002.Field work was I ,I performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage tanks (UST) sites. 2.1. DRILLING AND SAMPLING F=' On 31 January 2002, six soil borings were advanced at the site. The soil borings were advanced using a CME-75HT drill rig, equipped. with 8.25-inch diameter hollow-stem augers to install monitoring wells MW1 through MW5 and 15-inch diameter hollow-stem augers to install =� extraction well EWL The drill rig and three-man crew were supplied by Mitchell Drilling Environmental. Auger returns generated by drilling were containerized in properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site. I1-- Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaDed 2-inch by 6-inch brass sleeves.The samples were collected at five-foot intervals,beginning at 5 feet below surface grade(bsg) in well borings MW1,MW3,MW4,MW5 <� and EW 1 and beginning at 25 feet bsg in well boring MW2 using a 140-pound hammer to advance the sampler. The number of blows required to advance the sampler over each 6-1nch increment of the 18-inch sampling interval was recorded on the boring logs. Sampling equipment was washed in ` an Alconox solution and rinsed with water prior to each sampling run to minimize cross- contamination. For each sample,both ends of the leading or other selected sleeve were covered with Teflon sheets, capped and sealed with tape.The samples were labeled,stored on ice and transported under chain-of- Advanced GeoEnvironmental,Inc.